Compatibilization of Polymer Blends by Complexation. 3. Structure Pinning during Phase Separation of Ionomer/Polyamide Blends
Compatibilization of Polymer Blends by Complexation. 3. Structure Pinning during Phase Separation of Ionomer/Polyamide Blends
复制标题
通过络合使聚合物共混物增容。
作者：
Yi Feng;R. Weiss;C. Han
利用光散射和光学显微镜研究了强分子间相互作用对离聚物/聚酰胺共混物相行为和相分离动力学的影响。轻度磺化的聚苯乙烯（Li-SPS）离聚物的锂盐（4.0- 9.5mol%磺化）和聚（N，N ′-二甲基亚乙基癸二酰胺）（mPA）由于形成离子-酰胺络合物而可混溶。共混物表现出LCST型相行为。相分离可以是热诱导的并且是热力学可逆的。由于结构钉扎，相分离过程在几小时后停止，这可能是由于离子-酰胺络合物在富含离聚物的相中的浓缩和/或在富含离聚物的相中形成微相分离的离子聚集体。
The effects of strong intermolecular interactions on the phase behavior and phase separation kinetics of an ionomer/polyamide blend were investigated by light scattering and optical microscopy. The lithium salt of lightly sulfonated polystyrene (Li-SPS) ionomers (4.0-9.5 mol % sulfonation) and poly(N,N'-dimethylethylene sebacamide) (mPA) are miscible as a result of the formation of an ion-amide complex. The blends exhibit LCST-type phase behavior. Phase separation can be thermally induced and is thermodynamically reversible. The phase separation process stalls after a couple of hours due to structure pinning, which may be due to concentration of the ion-amide complexes in a ionomer-rich phase and/or the formation of microphase-separated ionic aggregates in the ionomer-rich phase.